What is the probability that an integer selected from the set of integers (20, 21, ...., 30) is a prime number?
Answer Details
The set of integers from 20 to 30 is {20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30}. We need to find the probability of selecting a prime number from this set.
Prime numbers are the numbers that are only divisible by 1 and themselves. The prime numbers in this set are 23 and 29. So, out of the 11 numbers in the set, only 2 are prime.
Therefore, the probability of selecting a prime number from the set is 2/11.
Hence, the answer is (a) 2/11.